WO2007104200A1 - Procédé de transfert de données d'ethernet à grande vitesse à un réseau de transport optique, et interface de données et dispositif associés - Google Patents

Procédé de transfert de données d'ethernet à grande vitesse à un réseau de transport optique, et interface de données et dispositif associés Download PDF

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Publication number
WO2007104200A1
WO2007104200A1 PCT/CN2006/003185 CN2006003185W WO2007104200A1 WO 2007104200 A1 WO2007104200 A1 WO 2007104200A1 CN 2006003185 W CN2006003185 W CN 2006003185W WO 2007104200 A1 WO2007104200 A1 WO 2007104200A1
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WIPO (PCT)
Prior art keywords
data
sublayer
optical transmission
rate
transmission network
Prior art date
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PCT/CN2006/003185
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English (en)
Chinese (zh)
Inventor
Jianchang Li
Deliang Wu
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2006800124027A priority Critical patent/CN101160845B/zh
Publication of WO2007104200A1 publication Critical patent/WO2007104200A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2491—Mapping quality of service [QoS] requirements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H04J3/1658—Optical Transport Network [OTN] carrying packets or ATM cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/60—Router architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/62—Wavelength based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H04J2203/0085—Support of Ethernet

Definitions

  • the 802.3 Ethernet (Ethernet) protocol has undergone a rapid development since its inception and is now the undisputed de facto standard in the Local-Area (LAN). Its transmission form has evolved from the original 10M thick cable bus to 10Base2 of thin cable, to 10Base-T of lBase5 twisted pair, 100Base-TX for Fast Ethernet Category 5 transmission, 100BaseT4 for 3rd line transmission and optical transmission. 100BaseFX, and the subsequent emergence of Gigabit Ethernet, including 1000Base-SX for short-wavelength optical transmission. 1000Base-LX for long-wavelength optical transmission and 1000Base-T for Category 5 transmission. In 2002, IEEE (The Institute of Electrical and Electronics Engineers, 10th Institute of Electrical and Electronics Engineers) officially passed the 802.3ae 10 Gigabit Ethernet (10GE) standard.
  • 10 Gigabit Ethernet technology is a "high-speed" Ethernet technology that is compatible with traditional Ethernet modes, using the same Media Access Control (MAC) protocol as the traditional Ethernet, and the same variable length. Frame format and same minimum and maximum frame length (64 to 1514 byte grouping).
  • the MAC in 10GE defined by 802.3ae works at a standard lOGbps and can be transmitted through two forms of physical layer, LAN physical layer (LAN PHY) and wide area network physical layer (WAN PHY).
  • the LAN PHY provides a transmission rate that matches the 10G MAC, and operates at a nominal line rate of 10.3125 Gbps (ie, the rate at which 64 Gbps of service data is 64B/66B encoded); the WAN PHY provides the current number
  • the Synchronous Digital Hierarchy (SDH) is a seamlessly connected transmission interface that provides a service data transmission rate of 9.58464 Gbps in the OC192C frame format.
  • Optical Transport Network As the bandwidth requirements of transmission services continue to increase, the application of Optical Transport Network (OTN) is becoming more and more widespread. How to transmit 10GE services directly through the OTN network with high quality and efficiency is an important topic of current research. There is an inherent line rate difference between 10GE and OTN. As mentioned above, the 10G MAC operates at a standard lOGbps, and the physical layer encodes a transmission rate of 10.3125 Gbps, while the OTN optical channel payload unit (OPU2, Optical) Channel Payload Unit) The nominal data rate of the payload is 9,995,276,963 bps (for the sake of simplicity, the following value is replaced by an approximate value of 9,9953 Gb/s), so there is a certain difficulty in seamlessly transferring data between networks.
  • OTN optical channel payload unit
  • the 10GE WAN interface sub-layer is used to process the 10GE service into the OC192C frame format and then mapped to the OTU2 through the WAN interface Sub-layer (WIS) in the existing WAN PHY.
  • WIS WAN interface Sub-layer
  • the 10GE LAN interface is used to convert the Ethernet frame into a flow control GFP frame and then map it to OTU2 through a GFP (Generic Framing Procedure) with flow control.
  • the interface that is connected to the 10GE-LAN and the SDH network is further mapped to OTU2 by using the existing GFP mode with flow control;
  • the 10GE LAN interface is used to directly map the 10GE service to the OTU2. Because the 10GE service data rate is slightly larger, the method needs to occupy part of the OTC2 FEC (Forward Error Correction) byte, which is lower than the FEC. Gain
  • the above schemes 1, 2, 3, and 4 implement mapping of 10G MAC frames to OTU2, which requires two or more mapping processes, which not only increases the complexity of the device in physical design, but also needs to utilize complex packaging techniques.
  • the 10G MAC frame is encapsulated into a standard intermediate data packet for transmission, which reduces the transmission efficiency.
  • schemes 5 and 6 can directly implement 10GE services transparently to the OTN network in the PHY layer, but need to occupy a certain FEC area to transmit 10GE services or need to extend OTU2 frames, the above two schemes will destroy the standard form of the OTU2 frame,
  • the docking of different chips poses a big obstacle; and scheme 5 needs to adopt more complex enhanced FEC in order to ensure the coding gain of FEC, and the efficiency and transmission quality cannot be combined; and scheme 6 is not in conformity with the specification, and cannot smoothly transition to the future.
  • the 40 Gbps transmission environment because if some OTUs are at 10.7 GHz and other OTUs are at 11.1 GHz, it is impossible to combine multiple OTUs from different customers in a multiplexed manner.
  • the current processing methods are various, each has its own defects, and it is easy to form a network "island," which is inconvenient for network docking processing and information sharing.
  • the present invention provides a data transmission method and data interface and apparatus for a high speed Ethernet to optical transmission network that adapts to the optical network data rate and can ensure the quality and efficiency of service transmission.
  • a method of data transmission for a high speed Ethernet to optical transmission network includes:
  • the rate matched data is mapped into a data transmission structure of the optical transmission network for encapsulation and transmission.
  • a data interface connecting a high speed Ethernet and an optical transport network includes a media access control sublayer, a physical coding sublayer, an optical transport network access sublayer, and a physical medium adaptation sublayer;
  • the medium access control sublayer performs flow control on the Ethernet data unit, so that the output rate of the valid data in the output data does not exceed the data rate of the payload in the optical transmission network;
  • the physical coding sublayer receives the data unit controlled by the medium access control sublayer flow, performs encoding, and matches the rate of the output data to the payload in the optical transmission network by deleting the invalid code between the data units.
  • Data rate the rate of the output data to the payload in the optical transmission network by deleting the invalid code between the data units.
  • the optical transmission network access sublayer receives the data after the physical coding sublayer rate matching, maps it to the data transmission structure of the optical transmission network, encapsulates it, and sends it to the physical medium adaptation sublayer; the signal processing and transmission and reception .
  • a network device includes a data interface for connecting to a transport network, the data interface including the aforementioned data interface connecting a high speed Ethernet to an optical transport network.
  • the embodiment of the present invention solves the problem of multiple mappings or non-standard mapping formats in the prior art by the process of flow control, rate matching, and mapping encapsulation, and only needs to perform mapping and encapsulation of data once, and realize high speed directly at the physical layer.
  • the Ethernet service is transparently transmitted to the OTN network. Due to the rate matching during mapping, it can be carried out in a fully compliant form, ensuring the efficiency and quality of service transmission.
  • the solution of the present invention is not related to the specific network operation parameters, and is applicable not only to the mapping of the current 10GE service to the OTU2, but also to the mapping of the 40GE service to the OTU3.
  • DRAWINGS are not related to the specific network operation parameters, and is applicable not only to the mapping of the current 10GE service to the OTU2, but also to the mapping of the 40GE service to the OTU3.
  • FIG. 1 is a flow chart of an embodiment of a data transmission method of the present invention.
  • FIG. 2 is a diagram showing a data encapsulation structure in which an Ethernet frame is mapped to an OTU 2 according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a network structure of an embodiment of a data interface according to the present invention.
  • Figure 4 is a schematic diagram showing the flow of data of the data interface of Figure 3.
  • FIG. 5 is a schematic diagram of frame gap expansion performed by the MAC sublayer in FIG.
  • FIG. 6 is a schematic diagram of a data processing flow of the OTNIS sublayer in FIG. 3.
  • FIG. 7 is a schematic diagram of an embodiment of a router having a data interface of the present invention detailed description
  • Embodiments of the present invention provide a data transmission method, a data interface, and a device for a high-speed Ethernet to optical transmission network, and implement seamless transmission of a high-speed Ethernet service to an OTN network through a process such as flow control, rate matching, and mapping and encapsulation;
  • the media access control sublayer (MAC) and the physical coding sublayer (PCS, Optical Transport Network Interface Sub-layer) respectively perform the above processing process, and the physical medium
  • the adaptation sublayer performs signal exchange with the optical transmission medium.
  • an embodiment of a data transmission method of the present invention includes:
  • Step S110 Perform flow control on the Ethernet data unit so that the output rate of the valid data in the output data does not exceed the data rate of the payload in the optical transmission network.
  • the frame gap expansion method is used for flow control, including the following steps:
  • the output data refers to the encoded data, so the output rate of the valid data is It is necessary to take into account the gain brought by the coding; and according to the requirements of the system operation, the data unit often needs to set a certain length of the non-deletable invalid code, so the valid data needs to include the data unit and the non-deletable according to the system requirements. Invalid code; In addition, in the actual network, it is also necessary to allow the system clock to be within a certain range of jitter. Therefore, in the most severe case, the minimum frame gap length required for flow control should be guaranteed.
  • L eth is the frame length of the current data unit
  • L udIdle is the length of the invalid code that cannot be deleted according to system requirements
  • L dIdle is the length of the invalid code that can be deleted
  • v e is the transmission rate of the data unit after the flow control
  • P v is the coding gain of the coded data unit after the flow control, V.
  • v 2 is the optical transmission network service clock jitter range.
  • One embodiment of the present invention employs a proportional hierarchical frame gap extension algorithm, ie,
  • L e xidie ⁇ Int[(L rIc n em in - Lj nIdle )/n]+l ⁇ x n
  • Int represents the rounding operation
  • L exIdle is the frame gap length required to be extended
  • L inIdle is the actual frame gap
  • the length, n is the number of bytes included in each level set.
  • the advantage of using the above-mentioned proportional grading algorithm is that the length of the IPG appears in the form of n, 2n> 3n, and the IPG insertion can be performed modularly, which simplifies the implementation difficulty of the system, and the setting of n can be processed according to The bit width of the system is reasonably chosen, and it is usually appropriate to take 1 to 8 bytes.
  • Step S120 Encode the data unit after the flow control, and match the rate of the output data to the data rate of the payload in the optical transmission network by deleting the invalid code between the data units.
  • the coding mode in step S120 corresponds to the manner in which the coding gain is set in step S110.
  • the deleted invalid code belongs to the L dIdle part mentioned in step S110, and as long as step S110 ensures the flow control requirement, sufficient L dIdle can be deleted to ensure correct rate matching.
  • Step S130 Mapping the rate matched data to a data transmission structure of the optical transmission network for encapsulation and transmission.
  • mapping of data can be carried out in full accordance with the OTN network data structure specification specified in the ITU-T G.709 standard.
  • the present invention can also be used when the OTN network data structure specification changes.
  • the data mapping can be implemented according to the changed OTN network data structure specification.
  • the data encapsulation structure is shown in Figure 2.
  • the RES is reserved bytes (for detailed data encapsulation structure and definition, and extension based on basic frame structure, such as OPU virtual concatenation and ODU multiplexing, refer to ITU-T G
  • the specific provisions of the .709 standard are not repeated here:
  • the OPU OH mainly includes a payload structure identifier ( PSI, Payload Structure Identifier) byte, three adjustment control (JC, Justification Control) bytes and a negative adjustment opportunity (NJO, Negative Justification Opportunity) byte; in addition, a positive adjustment opportunity (PJO) is also filled in the payload area 221. , Positive Justification Opportunity ) Bytes.
  • PSI Payload Structure Identifier
  • JC Justification Control
  • NJO Negative Justification Opportunity
  • the PSI indicates a 256-byte area, the first byte of the area, PSI[0], is the payload type (PT, Payload Type), and the remaining bytes are included in the cascading
  • the overhead associated with customer signal mapping Since the PT code of the payload type of Ethernet data is not given in the ITU-T G.709 standard, the PT byte is defined as 2A (00101010) in the embodiment of the present invention (2A is hexadecimal) , 00101010 is binary). (The specific mapping rules for the Ethernet data unit to the OPU2 payload area can be referred to the "Transmission order" in the ITU-T G.709 standard, "from left to right, top to bottom".)
  • ODU OH Optical Channel Data Unit OH
  • OR Optical Channel Data Unit
  • FA OH Frame Alignment OH
  • OTU OH Transmission overhead
  • ODU OH mainly includes
  • Fault Type and Fault Location which is a multiframe byte indicating a 256-byte fault type and fault location message area
  • OTU OH mainly includes
  • the FA OH mainly includes a frame alignment signal (FAS, Frame Alignment Signalling) and a multiframe alignment signal (MFAS, MultiFrame Alignment Signal).
  • FAS Frame Alignment Signalling
  • MFAS MultiFrame Alignment Signal
  • an embodiment of the data interface connecting the 10G Ethernet and the OTN of the present invention includes a 10G MAC 310, a Reconciliation Sub-layer (RS) 320, and a 10Gb/s medium independent interface (XGMII, 10 Gigabit Media).
  • PMA Physical Medium Attachment
  • PMD Physical Medium Dependent
  • the 10G MAC 310 performs the function of the standard MAC, and in addition, performs the flow control of the Ethernet data unit, that is, the IPG calculation and insertion work.
  • the input Ethernet data unit (data frame) 510 is extended by the frame gap and output as a flow-controlled data unit (MAC frame) 520, that is, an extended frame gap is added based on the inherent frame gap L inIdle .
  • L exIdle to meet the required minimum frame gap L ridlemin , the specific operation process can refer to step S110 of the embodiment of the transmission method.
  • the MAC layer 310 operates at a standard 10 Gb/s rate, so the data rate of the flow-controlled data unit is 10 Gb/s, and is connected to the PCS sub-layer 340 through the XGMII interface 330;
  • the PCS sublayer 340 performs 64B/66B encoding, so the coding gain of the output data is 66/64;
  • the 10GE service clock jitter range is 100 ppm, and the OTN service clock jitter index is 20 ppm
  • the RS sublayer 320/ S code alignment algorithm depending on the length of the Ethernet frame, the frame gap L udIdle cannot be deleted, the minimum is 4 bytes, and the maximum is 7 bytes. Considering the worst case, the value of L udIdle is 7 bytes. Then the minimum frame gap length L rIdlemin required is:
  • the frame gap length L exldle to be expanded is obtained according to the above-mentioned ratio classification 4 wide expansion algorithm.
  • the RS sublayer 320 and the XGMII interface 320 are located between the MAC sublayer 310 and the PCS sublayer 340; the RS sublayer 320 maps the path data and associated control signals between the MAC sublayer 310 and the XGMII interface 330, and the XGMII interface 330 A logical interface between the 10Gb/s MAC sublayer 310 and the physical layer is provided.
  • the XGMII interface 330 and the RS sublayer 320 enable the MAC sublayer 310 to be connected to different types of physical media.
  • the PCS sublayer 340 implements the functions of the standard 10GBASE-R PCS sublayer, in addition to which rate matching is also performed between the MAC sublayer 310 and the OTNIS 350, which corresponds to the aforementioned transmission method, which performs the operations in step S120.
  • the flow-controlled 10GE MAC is received, 64B/66B encoding is performed, and the output data rate is matched from 10.3125 Gb/s to the optical transmission network by deleting the invalid code.
  • the data rate of the medium payload is 9.953 Gb/s; in the receiving direction, the inverse of the above process is performed, that is, the OTU2 payload standard bandwidth demapped by the OTNIS 350 is adapted to the 10GE by inserting the Idle code.
  • the service standard bandwidth is 10.3125 Gbit/s.
  • the OTNIS sublayer 350 performs mapping and demapping operations of the Ethernet frame data to the optical transmission unit, corresponding to the foregoing transmission method, which performs the operations in step S130. In one embodiment, specifically, mapping and demapping operations of 9.923 Gb/s Ethernet frame data to OTU2 are performed.
  • the data processing flow of the OTNIS sublayer 350 is shown in Fig. 6.
  • Insert ODU overhead including: GCC1 ⁇ 2, APS insertion; PM overhead insertion (simultaneous BIP8 calculation); TCM1-6 (simultaneous BIP8 calculation), TCMACT insertion, etc.
  • the standard physical access layer defined in the PMA sublayer 361 provides a serialized service interface between the upper layer and the PMD sublayer 362, serializing the upper layer data or serial signal to the PMD sublayer 362. Unstringing.
  • the PMD sublayer 362 is responsible for supporting the exchange of serialized symbol code bits between the PMA sublayer 361 and the medium for the exchange of serialized optoelectronic signals.
  • the PMD sub-layer 362 converts these electrical signals into a form suitable for transmission over a particular medium, such as various standard optical fibers.
  • the data interface connecting the high-speed Ethernet and the optical transmission network in the embodiment of the present invention can be widely applied to various network devices, for example, a switch, a router, and the like that connect 10GE LAN and OTN.
  • the following uses a router as an example to illustrate the application of the data interface of the present invention in a network device.
  • the router is shown in FIG. 7, and includes: a route processor 710, a switch 720 and an input port 730, and an output port 740.
  • the routing processor 710 is responsible for selection control, performance monitoring, and status reporting of the entire routing protocol.
  • Switch switch 720 is a packet cross-matrix based on network layer processing.
  • the input port 730 is divided into three types: one type of port 731 is an SDH frame with 10G MAC as the service, and the 10G MAC is taken out through the WIS sublayer; the type port 732 is to take out the 10G MAC directly from the 10G LAN; the other type of port 731 is With the data interface provided by the present invention, the OTU2 frame with the 10G MAC service is used to take out the 10G MAC through the OTNIS sublayer; the IP processing module of each port mainly performs IP performance monitoring and statistics on the data flow.
  • the output port also has three service forms: OTN frame, SDH frame and 10G LAN. Therefore, the router can adapt 10G MAC data into different network transmissions.
  • the technical solution of the present invention solves the problem of multiple mappings or non-standard mapping formats in the prior art by adopting a process such as flow control, rate matching, mapping encapsulation, etc., and only needs to perform mapping and encapsulation of data once, and realize high speed directly at the physical layer.
  • the Ethernet service is transparently transmitted to the OTN network. Due to the rate matching during mapping, it can be carried out in a fully compliant form, ensuring the efficiency and quality of service transmission.
  • the technology of the present invention can be widely applied to the seamless connection of a high-speed Ethernet to an OTN network, and is applicable not only to the mapping of the current 10GE service to the OTU2, but also to the mapping of the 40GE service to the OTU3.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé de transfert de données d'Ethernet à grande vitesse (10GE) à un réseau de transport optique (OTN), ainsi que l'interface de données et le dispositif associés. Le principe de base de l'invention repose sur la mise en oeuvre de la transmission continue du 10GE à l'OTN par le contrôle de flux, l'adaptation de débit et l'encapsulage des données mises en correspondance; MAC, OCS et OTNIS pouvant respectivement permettre de compléter le processus sur la base de la structure du réseau existant. Par ailleurs, la présente invention ne requiert qu'un encapsulage des données mises en correspondance, et met en oeuvre directement la transmission transparente du 10Ge à l'OTN sur la couche physique, en raison de l'adaptation de débit et à la mise en correspondance, de manière à répondre parfaitement aux normes, et à assurer l'efficacité et la qualité de la transmission de service.
PCT/CN2006/003185 2006-03-13 2006-11-27 Procédé de transfert de données d'ethernet à grande vitesse à un réseau de transport optique, et interface de données et dispositif associés WO2007104200A1 (fr)

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